The orifice flanges have modifications of radial tapped holes in the flange ring for meter connections. Need A Reliable Fitting?

There are the orifice plate carriers in these flanges for the reason of fitting meter connections.

The additional bolts available serve as a jack to allow the separation of the two flanges to change the orifice plate or for other relevant services like inspection.

Uses of orifice flanges:

Orifice flange is used to flow/rate metering of piping systems.

They are used for all intensive purposes, similar to weld neck and slip-on flanges with extra machining.

Orifice Flanges

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Welding neck and slip-on Orifice Flanges in class 300 only are conform
to ANSI B16.36. Other types and pressure classes are available and
sizes larger than 24" will conform to MSS SP-44 . Unions are furnished
with gaskets, carbon steel jack screws, pipes plug for the tapped
openings. and bolting per ANSI b16.5.